[android] Gradle failed to resolve library in Android Studio

I want to include a library in Android Studio , but it displays error like below :

"Failed to resolve:com.lemonlab:expandable-button-menu:1.0.0"

How to fix this problem?

    apply plugin: 'com.android.application'

    android {
        compileSdkVersion 21
        buildToolsVersion '21.1.2'

        defaultConfig {
            applicationId "ayowes.com.newecampus"
            minSdkVersion 15
            targetSdkVersion 21
            versionCode 1
            versionName "1.0"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android-ptimize.txt'), 'proguard-rules.txt'
            }
        }
    }

    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        compile 'com.android.support:appcompat-v7:21.0.3'
        compile 'com.google.android.gms:play-services:6.5.87'
        compile 'com.lemonlab:expandable-button-menu:1.0.0'
        compile files('libs/pinchzoom.jar')
    }

Solved by using "http://jcenter.bintray.com/" instead of "https://jcenter.bintray.com/".

repositories {
    jcenter( { url "http://jcenter.bintray.com/" } )
}

repositories {
    mavenCentral()
}

I added this in build.gradle, and it worked.

I had the same problem, the first thing that came to mind was repositories. So I checked the build.gradle file for the whole project and added the following code, then synchronized the gradle with project and problem was solved!

allprojects {
    repositories {
        jcenter()
    }
}

Check to see if your gradle is offline. Preferences-ProjectSettings-Gradle. If you're trying to add a library while offline, you'll see that error. Also, try Build-Clean, it may provide you with more detail.

Well, it's co.lemonlabs, you have a typo in your build.gradle:

compile 'co.lemonlabs:expandable-button-menu:1.0.0'

Source: https://github.com/lemonlabs/ExpandableButtonMenu#including-in-your-project

i had the same problem, i added the following lines in build.gradle

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }

        maven {
            url 'http://dl.bintray.com/dev-fingerlinks/maven'
        }
        mavenCentral()
    }
}

Try this

1. Clean project
2. Invalidate cache and restart studio
3. Check android SDK path is proper
4. Check is there any error in any of your resource file

Some time you may just need to add maven { url "https://jitpack.io" } in your allprojects block in project level build.gradle file.

Example:

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

You go File->Settings->Gradle Look at the "Offline work" inbox, if it's checked u uncheck and try to sync again I have the same problem and i try this , the problem resolved. Good luck !

For me follwing steps helped.

It seems to be bug of Android Studio 3.4/3.5 and it was "fixed" by disabling:

File ? Settings ? Experimental ? Gradle ? Only sync the active variant